6718 bottom coolant hose rubbing on crank pulley

[aliw]

Hi All.

I have a 1975 Zetor 6718 that I have had for about 8mths now.

I have had a water leak and fould the crank shaft pulley was rubbing and had worn through the bottom hose where it passes behind it against the timing chest. I put this down to bad routing of the hose by a previous owner.

I replaced the hose, but no-matter how I position it I only have a few mm clearance behind the pulley. I started the tractor up after refilling with coolant and as the hose expands with the coolant pressure/flow it has started to rub on the pulley again.

I was just wondering if anyone had had any issues with the crank pulley rubbing on the bottom radiator hose. Is there supposed to be a clamp or somethong to hold the hose back away from the pulley?

I have checked for endfloat on the crank and I do have about 1mm, which is not ideal and does reduce the clearance further, but it runs well with good oil pressure so didn't want to do a bottom end overhaul as I don't think this is the root cause. Can the pulley be spaced out to give more clearance (not sure if keyed, or taper)?

Any advice would be appreciated.

 

[Renze]

The hose is a one-size-fits-all solution which you need to cut to fit.

Twist it all the way against the block, then tighten the hose clamp, then attach to radiator. It took me two hoses before they told me it wasnt designed to fit, but to need field adjustment..

I thik the top needs to be cut some 5cm, and then the hose pulled down towards the radiator so it is prestressed.

 

[aliw]

Thanks for the reply. Glad someone has had this issue before as I couldn't find anything what I have done searches.

Will give shortening the hose a go. Hadn't really considered doing that as most hoses these days fit correctly straight out of the box.

Can you tell me what sort of clearance you have (and is ok) between the pulley, so I know I kind of have it positioned correctly.

 

[Renze]

It has been some years ago, but i think i had a centimeter of clearance, so it could expand a little when hot. Only cut at the top, its good if the radiator end is long and pushes the hose against the block.

 

[djsumcp20oldleawharfcouk]

Hi All.

I have a 1975 Zetor 6718 that I have had for about 8mths now.

I have had a water leak and fould the crank shaft pulley was rubbing and had worn through the bottom hose where it passes behind it against the timing chest. I put this down to bad routing of the hose by a previous owner.

I replaced the hose, but no-matter how I position it I only have a few mm clearance behind the pulley. I started the tractor up after refilling with coolant and as the hose expands with the coolant pressure/flow it has started to rub on the pulley again.

I was just wondering if anyone had had any issues with the crank pulley rubbing on the bottom radiator hose. Is there supposed to be a clamp or somethong to hold the hose back away from the pulley?

I have checked for endfloat on the crank and I do have about 1mm, which is not ideal and does reduce the clearance further, but it runs well with good oil pressure so didn't want to do a bottom end overhaul as I don't think this is the root cause. Can the pulley be spaced out to give more clearance (not sure if keyed, or taper)?

Any advice would be appreciated.

My 6718 has a clamp around the hose which is bolted to the steering pump.